21443243104 has 48 divisors (see below), whose sum is σ = 43986574800. Its totient is φ = 10277374464.

The previous prime is 21443243099. The next prime is 21443243147. The reversal of 21443243104 is 40134234412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45874 + ... + 212110.

It is an arithmetic number, because the mean of its divisors is an integer number (916386975).

Almost surely, 2^21443243104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21443243104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21993287400).

21443243104 is an abundant number, since it is smaller than the sum of its proper divisors (22543331696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21443243104 is a wasteful number, since it uses less digits than its factorization.

21443243104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166415 (or 166407 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21443243104 its reverse (40134234412), we get a palindrome (61577477516).

The spelling of 21443243104 in words is "twenty-one billion, four hundred forty-three million, two hundred forty-three thousand, one hundred four".